Which statement describes a physical property related to the particles that make up a material?
A. A fruit has a sour taste because some of the compounds that
make it up are acids.
B. A vegetable has a bitter taste because some of the compounds
that make it up are bases.
C. Salt crystals are hard and brittle because they are made up of
atoms that combine by ionic bonding.
D. An iron nail has a reddish color because iron atoms on its surface
combine with oxygen atoms.

Four objects are being tested to see how they are affected by fluid friction. object w has a surface area of 4.5 cm2, object x has a surface area of 2.5 cm2, object y has a surface area of 6.2 cm2, and object z has a surface area of 3 cm2. which object would experience the most fluid friction?

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

Which bonds are found inside a water molecule